Our little ladies are 5 months old and we got our first egg today-yippee! However, they refuse to go in the hen house. They laid the egg on the ground of the run. I've seen them wander up the ramp, but they sleep in the run on the roosts, even in the rain. They don't go into the house for protection. It's well vented, has some light from the vents, but not too much. The floor is vinyl for cleaning purposes and the boxes are lined with hay. Is this typical? Do I need to try and change this behavior?